Nas vs firewire drive

I've done some googling on this and concensus is that it depends on your network. Well I have comcast here in NJ and it sucks. My network connection is constantly dropping and my stupid NAS is always disconnecting. I didn't know the internet connection would effect the NAS.

I have a d-link dns 321 and I am not entirely sure why I wanted to get a NAS in the first place, I think because I may have been using my pc at that point next to my mac and wanted access to both devices but now my pc is dead so meh.